Breaker/Fuse/Wire Selection Chart For Motors

[kbcombs]

Hi all,
Does anyone here know or use an online graph or chart for quick selection of breaker/fuse size, wire size, and FLA for motors with various voltages ie, 208, 230, 460? I tried google but I didn't come up with what I was looking for. Thanks...

Kyle

 

[rsdoran]

Its not exactly a chart but see if this helps:
http://www.bussmann.com/library/docs/spd02/SPDSection11.pdf

There is alot of info at: http://www.patchn.com

One of the best and cheapest references to obtain is the UGLY's electrical reference BOOK: http://www.uglyselectrical.com/

Many distributors will give you one of these if you are a regular customer.

 

[kbcombs]

rsdoran,
Thanks for the reply. The bussmann link wasn't exactly what I was looking for. I have an Ugly's book, but it's pretty generic. Because I am freakishly lazy, I am looking for something that basically says if I have a 10HP/3P motor at 460 VAC I should use a x-Amp Circuit Breaker or x-Amp Fuses and run x-AWG wire and be within NFPA code (most of the time anyway). I did find something real close but it only had 460 and 208 VAC. No 230 VAC for 3 phase... Go figure. Here is the link though:

http://www.emsco.net/starter-sizing.htm

 

[Jim Dungar]

Try this one:
http://www.squared.com/us/squared/corporate_info.nsf/unid/C16C1C0106A0374985256A5400653380/$file/softwareFrameset.htm

It is for IEC starters selection, but all of the other motor data is "universal".

 

[Eric Nelson]

Ask your electrical supply house for one of those cardboard 'slide rule' motor data calculators. They give 'em away free. I've got probably half a dozen of these laying around. No computer needed!...


-Eric

 

[TConnolly]

I used to have an application for my Palm PDA that did just that. I don't remember where I got it, but I found it while looking for free-ware for it. Try a search for palm pilot software.

There are some neat calculators at electrician.com, not what you're looking for right now but some good stuff for future reference.

 

[elevmike]

Ask your electrical supply house for one of those cardboard 'slide rule' motor data calculators. They give 'em away free. I've got probably half a dozen of these laying around. No computer needed!...

Bingo! Call your local Square D distributor and just ask. You'll get a box of em' the next day or so..

 

[Tark]

Buy the NEC book, it's the code after all.

 

[Lancie1]

KBCombs,

You can do as I do, and make up your own chart or spreadsheet based on Table 430.152 of the National Electrical Code.

Col 1: Voltage
Col 2: Phases (1 or 3)
Col 3: Horsepower
Col 4: Full Load Amps (Look up in NEC Table 430-150)
Col 5: Time-Delay Fuse Size (= Full Load Amps X 200%)
Col 6: Circuit Breaker Size (= Full Load Amps X 275%)

If anyone needs one I can post my Excel spreadsheet.

 

[JvdV]

Please post your excel sheet. It would be nice to see how you have set up the excel sheet.

Jurgen

 

[rta53]

I have a program on my desktop called Motor Protection 2004. It will do what you are wanting to do but only for 480VAC. Seems like I got this off of this site but I can't remember. I also have an ElectriCalc Pro. The program that Alaric is refering to is called MotorDataPro. It runs on the Palm OS.

 

[93lt1]

http://www.sscautomation.com/downloads/Motor%20Protection%202004.zip

Here is a link to the one rta53 is talking about. The information provided only includes 480 volt motors. This program was more or less one of the guy's "Intro to VB" project. If you download it and it doesn't work you will need the VB runtimes.

There is also a PocketPC (2002) version.
http://www.sscautomation.com/downloads/Motor Protection 2004.zip

 

[rta53]

There is also a PocketPC (2002) version.

Where might one find the PPC version?

 

[93lt1]

Well, I used the code from the VB 6 version in my own "intro to eVB" (VB for PocketPC) project. I made it for my own use and never did anything else with it. I'll post it here when I get back to my other computer. (probably tonight).

 

[Lancie1]

Motor Fuse & Breaker Sizes

Okay Jvdv, Here is the Excel spreadsheet called Motor Fuse & Breaker Sizes"